Rock-drill.



G. JACKSON.

ROGK DRILL. APPLICATION FILED 001'. 17, 1007.

Patented Apr. 6, 1909.

2 SHEETS-SHEET 1.

EM is Q n IN VENTEIR BUHWILL JACKSDN.

O. JACKSON.

ROUK DRILL. APPLICATION FILED OUT. 17, 1907. 91 7,731 Patented Apr. 6, 1909 2 sHEETssHB T 2. F 2 a 54 WITNESSES: INVENTUH CEIHWILL. JACKSON.

J" W4 w. M

UNITED STATES Olflillhlil.

OORWILL JACKSON, OF MADISON, WISOONSIN ASSIGNOR TO NORTHERN MANUFACTURING COMPANY, A CORPORATION OF WISCONSIN ELECTRICAL ROCK-DRILL.

Specification of Letters Patent.

Patented April 6, 181%).

Original application filed March 10, 1906, Serial No. 305,252. Divided and this application filed October 17, 1am.

Serial No. 397,808.

To all whom it may concern:

Be it known that I, CORWILL JACKSON, a citizen of the United States, residing at Madison, county of Dane, State of lVisconsin, have invented c rtain new and useful Imrovements in Rick-Drills, of which the folowing is a specification.

This is a division of my prior application Serial No. 305,252, filed March 10, 1906.

My present invention relates to mechanism such as rock drills, rock surfacers, riveting machines and the like, in which a tool or device is actuated by hammer blows.

My invention comprises certain novel features of construction and arrangement of a rock drill or similar device in which the hammer may be used.

The various forms of novelty which characterize my invention are pointed out with articularity in theclaims annexed to and orming a part of this specification For a better understanding of my invention, however, and the advantages possessed by it, reference may be had to the accompanying drawing and descriptive matter in which I have illustrated and described one of the forms in which my invention may be embodied. In the drawings Figure 1 is an elevation partly in section of a rock drill constructed in accordance wlth my invention; Fig. 2 a section on the lines 3-3 of Fig. 3; lrig. 3 is a lan view of the tool and tool holding means; i 1 is an end clcvationshowing the movab e cross-head and tool with the latter in section; and Fig. 5 is a perspective view of a portion of the drill bit and the piston with which it is connected.

Referring to the drawing, 1 re resents the frame of a rock drill proper whic 1 adapted to be slidably mounted on suitable supports in the usual manner. The rear end of the frame 1 is provided wit-h a curved seat :2 in which the field ring 3 of an electric motor is mounted. The field ring clampedin place in the seat 2 by means of an are shaped piece 4 which engages with a hook or jaw 5 formed for the purpose on the frame at one side of the motor, and with a bolt and nut fastening device 6 secured to the seat 2 at the opposite side of the motor.

The armature shaft 7 of the motor drives a shaft 10 which extends parallel to thearmature shaft. 7 b means of a belt 8, a belt tightener an pulleys 7 and 10 On the The gear wheel 32 drives the stances.

shaft 10 is keyed a somewhat massive member 11 which when in motion has consider able momentum. floating hammer members '13 are adapted to deliver blows to the adjacent end of a piston member 12 slidably mounted in a tubular portion 12 of the cas ing 1, as clearly described in my previous application, of which this is a divisional case.

The piston 12 is provided with diametrically opposed longitudinally extending slots 36 into which extend keys or ribs of a gear mounted upon the piston. The gear 35 meshes with a worm 34 keyed to the shaft journaled in the frame and extending parallel to the shaft 10. The shaft 33 also has mounted upon ita gear wheel 32 which is geared to the shaft 10 through gears 31. shaft through a friction clutch not. shown.

A chamber 38 is formed in the barrel ortion of the casing surrounding the body 0 the 'iston 12 through which a fluid is admitted rom a suitable reservoir or pump through the pipe 39 connected to the cover member 40. Preferably theiluid employed is water; though air may be used under some circum- To prevent the escape of lluid entering the chamber along the surface of the piston, packing members 41 are employed which are held in place by a helical spring 42.

As shown in Fig. 2, the forward end of the iston member 12 is provided with a socket mto which the hollow drill bit or tool 1-3 is inserted. The passage 54: in the piston es tablishes communication between the chamber 38 and the bore 4% of the tool. A tubularpackinga l isprovidcd forpreventingleakage of the lluid out of the tool receiving socket.

The tool -l3 is provided with a shoulder 45 which abuts against the end of the piston 12 and with an enlarged portion 516, substantially rectangular in cross section, which err-- ters a corresponding recess 46 in the end of the piston 12. The outer end of the piston 12 is located within a chambered cross-head member 47 which is connected to the casino 1 by bolts 48. As shown, helical springs 49 surround the bolts 48 and extend between the forward surface of the cross-head member 47 and-nuts 50 carried by the forward ends of bolts. To secure the drill bit in place a U-sha ed device 51 is employed which passes tfirough slots formed for t e purpose in the forward endof the cross-head member and straddles the drill bit or tool in front of the shoulder 45. When the; device 51 has been placed in position a split pin 37 is put through a hole 1n one end of the leg of the U so as to keep the device 51 from being jarred out by the hammer blowsof the drill. In the stationary osition of the a paratus the springs 49 old the cross-hea in the posi trons shown clearly in Figs. 1 and .3, at which time the piston 12 is at the backward limit of its movement with the shoulder 52 :formed on it en a ing the forward end of the In the normal 0 eration of the device the motor 7 rotates t e shafts 10 and 31 and causes the hammer members to deliver rapid blows upon the inner end of the piston 12. The rotation of the shaft 10 causes the gear wheel 32-to revolve, and through the friction clutch the corresponding rotation of the worm wheel 34 is obtained. This results in a slow rotation of the piston 12 and consequently the tool 43. At each blow on the inner end of the piston, the piston and drill bit are advanced more or less depending upon the nature of the material upon which the tool is working. After each blow the piston is moved backward to the position shown in Fig. 1 by the springs 49. It will be understood that the frame 1 is advanced as the material upon which the tool is o )erating is Worn away.

The fluid entering through the pipe 39 passes outward to the working ends of the tool and causes the chips formed by the tool to be forced awa from its cutting edge. With the tool s iown they may escape through the passages 53 formed in the tool. Should the tool not be in contact with the work at the instant the piston is given the hammer blow, the entire energy of the blow is taken up by the buffer springs 49.

The construction hereinbofore described and illustrated has been found in actual practice to give excellent results from the standpoint of durability and effectiveness. It will be obvious, however, to those skilled in the art that changes may be made in the form of my invention Without departing from the spirit thereof and that certain features of my invention may be used without a corresponding use of other features.

I do not wish the claims hereinafter made to be limited to the particular embodiment of my invention shown and described more than is made necessary by the state of the art.

What I claim as new, and desire to secure by Letters Patent of the United States, is,%

1. In a rock drill, a piston having a tool socket formed in it, a tool located in said socket and a s ring-pressed crosshead for holding the too in the socket.

2. In a rock drill, a piston having a socket formed -in one end, a tool in said socket, a cross-head holding the tool in, position, means for periodically imparting .a forward movement to the piston and thereby to the tool, and resilient means for supporting the cross-head, said means being put under tension by the forward movement of the piston and serving to return the tool and piston after each forward movement.

3. In a rock drill, a movable piston having a tool socket formed in it, a tool located in said socket and arranged to move with said piston, and a s ring-pressed cross-head for holding the piston an the tool against rela- I live movement.

5. In a rock drill, a tool, a movable piston for operating said tool, and a spring-pressed cross-head for holding the piston and tool together.

6. In a rock drill, a frame, a piston mov able in the frame, a tool carried by the piston, and cross-head yieldingl connected to said frame and arranged to hold the tool to the piston.

7. In a rock drill, a spring-pressed crosshead member having slots, a movable piston having a tool socket formed therein, a tool fitting in said socket and having a shoulder, and a U-shaped device assing through said slots and straddling said tool in front of said shoulder.

8. In a rock drill, a spring-pressed crosshead member having slots, a movable piston having a tool socket formed therein, a tool fitting in said socket and having a shoulder, a U-shaped device passin through said slots and straddling said too in front of said shoulder, and means for holding said U- shaped device in said position.

9. In a rock drill, a member having slots, a movable piston having a tool socket formed in it, a tool having a shoulder, and a device passing through said slots and straddling said tool in front of said shoulder,

a movable member therein having a tool I 1.11 witness whereof, 1 have hereunto set sockat formed 1n 1t, a tool hzmng a shoulder, my hand thls 14th day 0t Gctober, 1907.

all-shaped device assin 'throu h said slots 4 Y and straddling szfd too in fr niof saidv ("ORVVILL JACKSON .5 shouidmgythereby holding said tool in said. I Witnesses:

socket, and means for holding said device in EMIL A. LAMBREQHT, posmon. i H. Lv MORRIS. 

